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peacher5/run.c

Last active March 30, 2018 07:20
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ComPro Lab (File & Struct)
Raw
run.c
#include <stdio.h>
#include <stdlib.h>
typedef struct item {
char name[20];
float price;
int pcs;
} Item;
typedef struct stock {
int n_item;
Item *items;
} Stock;
void updateStock(Stock stock) {
int i;
FILE *file = fopen("stock.txt", "w");
fprintf(file, "%d\n", stock.n_item);
for (i = 0; i < stock.n_item; i++) {
fprintf(file, "%s\t%.2f\t%d\n", stock.items[i].name, stock.items[i].price, stock.items[i].pcs);
}
fclose(file);
}
void addStock() {
char name[20];
float price;
int pcs, size;
printf(" Enter a item name, item price and quantity:\n >> ");
scanf("%s %f %d", name, &price, &pcs);
FILE *file = fopen("stock.txt", "a+");
fprintf(file, "%s\t%.2f\t%d\n", name, price, pcs);
fseek(file, 0, SEEK_SET);
fscanf(file, "%d", &size);
fclose(file);
file = fopen("stock.txt", "r+");
fprintf(file, "%d", size + 1);
fclose(file);
}
int main() {
Stock st;
int i, no, pcs, mode;
float sum = 0;
char more;
while (1) {
printf("\nSelect Mode (1 = Customer / 2 = Add item): ");
scanf("%d", &mode);
if (mode == 2) {
printf(" Add Item:\n");
addStock();
} else break;
}
printf("\n");
FILE *file = fopen("stock.txt", "r");
fscanf(file, "%d", &st.n_item);
st.items = (Item*) malloc(st.n_item * sizeof (Item));
printf(" No. | Item | Price | Pcs.\n");
printf("-----|-----------------|----------|--------\n");
for (i = 0; i < st.n_item; i++) {
fscanf(file, "%s %f %d", st.items[i].name, &st.items[i].price, &st.items[i].pcs);
printf("%4d | %15s | %8.2f | ", i+1, st.items[i].name, st.items[i].price, st.items[i].pcs);
if (st.items[i].pcs <= 0)
printf("%6s\n", "N/A");
else
printf("%6d\n", st.items[i].pcs);
}
fclose(file);
printf("\n What do you want to buy?\n");
printf(" Type a item number, then a quantity:\n");
while (1) {
printf(" >> ");
scanf("%d %d", &no, &pcs);
if (no < 1 || no > st.n_item) {
printf("Invalid item number.\n");
continue;
}
if (pcs <= 0) {
printf("Invalid item quantity.\n");
continue;
}
if (st.items[no-1].pcs <= 0) {
printf("%s is out of stock.\n", st.items[no-1].name);
continue;
}
if (pcs > st.items[no-1].pcs) {
printf("Max item of %s = %d.\n", st.items[no-1].name, st.items[no-1].pcs);
continue;
}
st.items[no-1].pcs -= pcs;
sum += st.items[no-1].price * pcs;
printf(" Add more? (y/n): ");
scanf(" %c", &more);
if (more == 'N' || more == 'n')
break;
}
printf("\nTotal amount is %.2f. Thanks. <3\n", sum);
updateStock(st);
}
Raw
stock.txt
5
Lays 30.00 5
KitKat 25.50 8
Jelly_Bean 42.50 7
Oreo 30.00 0
Eclair 25.00 10
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